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| FEXT loss is a measure of the unwanted signal coupling from a transmitter at the near-end into another pair measured at the far-end. Pair-to-pair ELFEXT is expressed in dB as the difference between the measured FEXT loss and the insertion loss of the disturbed pair. PSELFEXT is a computed ratio that takes into account the combined crosstalk on a receive pair from all the far-end disturbers operating simultaneously. FEXT loss or pair-to-pair ELFEXT shall be measured for all pair combinations for components and cabling, in accordance with ASTM D4566 FEXT measurement procedure and in accordance with Annex D of ANSI/TIA/EIA-568-B.2.
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